Struct ScalarHiddenLines 

pub struct ScalarHiddenLines;

Portable exact hidden-line provider for orthographic and perspective views.

Visibility is decided exactly in the view’s affine frame: nothing is rounded before a decision, only the endpoints of the output pieces are (each the exact point rounded once). For every edge it examines the triangles whose view-space bounding box can matter, found in an axiolid-spatial BVH; in the worst case (everything overlaps in the image) the cost still grows with edges times triangles, and max_candidate_pairs bounds it.

A near clipping plane that cuts a MeshRole::Solid leaves a cap that occludes (decided by ray parity with a symbolic perturbation of the image point); a solid wholly beyond the plane is removed: it neither occludes nor is drawn. A failure to produce an endpoint (a coordinate beyond the binary64 range) is Degenerate and names the mesh of the edge.

Implementations

impl ScalarHiddenLines

pub const ID: BackendId

Stable identity of this provider.

pub const fn new() -> Self

Construct the provider.

Trait Implementations

impl Backend for ScalarHiddenLines

fn descriptor(&self) -> BackendDescriptor

Runtime descriptor and capability inventory.

impl Clone for ScalarHiddenLines

fn clone(&self) -> ScalarHiddenLines

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Copy for ScalarHiddenLines

impl Debug for ScalarHiddenLines

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for ScalarHiddenLines

fn default() -> ScalarHiddenLines

Returns the “default value” for a type.

impl MeshHiddenLines for ScalarHiddenLines

fn scratch_requirement(&self) -> ScratchRequirement

Scratch needed beyond inputs and result.

fn cancellation_granularity(&self) -> CancellationGranularity

How finely the provider polls cancellation.

fn supports_projection(&self, projection: ViewProjection) -> bool

Whether the provider draws views of this projection. The default is true for ViewProjection::Orthographic only, so a provider written before ViewProjection existed, which ignores the field, is never given a perspective view by a registry (ADR 0107). A provider that returns true for a projection must draw it exactly and pass that projection’s conformance suite.

fn hidden_lines( &self, request: &HiddenLineRequest<'_>, options: &ExecutionOptions, ) -> Result<HiddenLineOutcome, HiddenLineError>

Draw the selected edges of request.meshes in request.view. Implementations must enforce request.limits before growing output.